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[Qemu-devel] [PATCH v1] test-coroutine: test cost introduced by coroutin
From: |
Ming Lei |
Subject: |
[Qemu-devel] [PATCH v1] test-coroutine: test cost introduced by coroutine |
Date: |
Wed, 13 Aug 2014 18:08:47 +0800 |
This test runs dummy function with coroutine by using
two enter and one yield since which is a common usage.
So we can see the cost introduced by corouting for running
one function, for example:
Run operation 20000000 iterations 4.841071 s, 4131K operations/s
242ns per coroutine
Signed-off-by: Ming Lei <address@hidden>
---
tests/test-coroutine.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/tests/test-coroutine.c b/tests/test-coroutine.c
index 6e634f4..e22fae1 100644
--- a/tests/test-coroutine.c
+++ b/tests/test-coroutine.c
@@ -311,6 +311,35 @@ static void perf_baseline(void)
maxcycles, duration);
}
+static __attribute__((noinline)) void perf_cost_func(void *opaque)
+{
+ qemu_coroutine_yield();
+}
+
+static void perf_cost(void)
+{
+ const unsigned long maxcycles = 40000000;
+ unsigned long i = 0;
+ double duration;
+ unsigned long ops;
+ Coroutine *co;
+
+ g_test_timer_start();
+ while (i++ < maxcycles) {
+ co = qemu_coroutine_create(perf_cost_func);
+ qemu_coroutine_enter(co, &i);
+ qemu_coroutine_enter(co, NULL);
+ }
+ duration = g_test_timer_elapsed();
+ ops = (long)(maxcycles / (duration * 1000));
+
+ g_test_message("Run operation %lu iterations %f s, %luK operations/s, "
+ "%luns per coroutine",
+ maxcycles,
+ duration, ops,
+ (unsigned long)(1000000000 * duration) / maxcycles);
+}
+
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
@@ -325,6 +354,7 @@ int main(int argc, char **argv)
g_test_add_func("/perf/nesting", perf_nesting);
g_test_add_func("/perf/yield", perf_yield);
g_test_add_func("/perf/function-call", perf_baseline);
+ g_test_add_func("/perf/cost", perf_cost);
}
return g_test_run();
}
--
1.7.9.5
- [Qemu-devel] [PATCH v1] test-coroutine: test cost introduced by coroutine,
Ming Lei <=